having replaced a second chip - it's working!

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Interesting. All my Macs have returned an error code which indicated more than one chip at fault. But Tom Lee is correct, it's hardly a comprehensive diagnostic. However, I have found more often than not, that if one RAM chip has failed due to bit-rot (a symptom that seems exacerbated by extended periods of disuse), that it is usually not alone. Perhaps RAM is not unlike the human brain, if it sits idle for long periods of time, it begins to lose its ability to store and recall memories.